How long is the mid-ocean ridge, Earth's longest mountain range?
65,000 km. It wraps the globe like the seam on a baseball, and more than 90% of it lies unseen underwater.
How close would your guess have been?
In the game we ask it like this: “Earth's longest mountain range hides underwater — how many km does it stretch?”
Type a number — scored exactly the way a round in the game is.
The answer
65,000km
65,000 km in other units
- 40,389 miles



